function valid(){
a = document.frm;
if(a.txtName.value==""){
alert("Please enter your Name");
a.txtName.focus();
a.txtName.select();
return false;
}
if(a.txtEmail.value==""){
alert("Please enter your Email");
a.txtEmail.focus();
a.txtEmail.select();
return false;
}
else
{
	var emailfilter=/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i
	var returnval=emailfilter.test(document.frm.txtEmail.value)
	if (returnval==false){
		alert("Please enter a valid email address.")
		document.frm.txtEmail.select()
		return false;
}
}
if(a.txtContactno.value==""){
alert("Please enter your Phone Number");
a.txtContactno.focus();
a.txtContactno.select();
return false;
}
if(a.txtMobno.value==""){
alert("Please enter your Mobile Number");
a.txtMobno.focus();
a.txtMobno.select();
return false;
}
if(a.txtComments.value==""){
alert("Please enter your Enquiry");
a.txtComments.focus();
a.txtComments.select();
return false;
}
return;
}